ABB PR512 Self-Supplied Protection Relay

ABB PR512 Self-Supplied Protection Relay Supplier, Exporter in India

ABB PR512 Protection Relay for Medium Voltage Circuit Breakers

ABB PR512 is a microprocessor-based, self-supplied protection relay developed for medium-voltage switchgear and circuit-breaker protection. It was commonly used with ABB HD4 circuit breakers and in primary and secondary distribution switchboards for protecting MV/LV feeders and transformers. The relay takes the energy required for protection and breaker tripping from the current transformers, so the basic protection functions can operate without a separate auxiliary power supply.

PR512 is especially relevant today for plants and substations where older ABB switchgear is still in service. Most enquiries are for an ABB PR512 replacement relay, PR512 spare unit, PR512/P relay, PR512/PG relay or PR512/PD relay for an existing circuit breaker or switchboard.

ABB PR512 Models

The PR512 range was supplied in different protection configurations. ABB’s service documentation identifies the following main versions:

ABB PR512/P – 1VCF349899S0111

PR512/P is the basic protection version used for phase overcurrent protection. It provides:

• ANSI 51 overload/time overcurrent protection
• ANSI 50 instantaneous or delayed short-circuit protection
• Display of the phase carrying the highest current
• Self-powered protection operation

ABB PR512/PG – 1VCF349899S0112

PR512/PG is the PR512 version associated with phase and earth-fault protection requirements. ABB’s earlier PR512 documentation describes the corresponding protection arrangement with:

• ANSI 51 overload protection
• ANSI 50 short-circuit protection
• ANSI 51N earth-fault protection
• ANSI 50N instantaneous or delayed earth-fault protection
• Highest-loaded phase current indication

ABB’s current service documentation identifies this spare/version designation specifically as PR512/PG.

ABB PR512/PD – 1VCF349899S0113

PR512/PD adds communication or dialogue capability to the phase and earth-fault protection functions.

• ANSI 50 phase short-circuit protection
• ANSI 51 phase overcurrent protection
• ANSI 50N earth-fault protection
• ANSI 51N earth-fault protection
• Dialogue/communication function
• Connection to an electrical installation management system
• Auxiliary supply required for dialogue and control functions

Technical Specifications

• Product family: PR512
• Relay type: Microprocessor-based self-supplied protection relay
• Main versions: PR512/P, PR512/PG and PR512/PD
• Protection functions: 50, 51 and, depending on version, 50N and 51N
• Application: Medium-voltage switchgear and circuit-breaker protection
• Current transformer secondary current: 1 A
• CT performance: 2.5 VA
• CT accuracy: 5P10
• Frequency: 50 / 60 Hz
• Supported primary CT settings documented by ABB: 40 A, 80 A, 100 A, 150 A, 200 A, 250 A, 600 A and 1250 A
• Self-supply operation starts from approximately 0.2 × In on at least one CT-equipped phase
• Optional auxiliary supply: 24 V DC nominal
• Auxiliary supply range: approximately 19.2 to 33 V DC
• Auxiliary supply is required for PR512/PD dialogue and control functions
• Permitted continuous overload: 1.5 × In
• Short-duration overload: 6 × In for 30 seconds
• Short-time current withstand: 25 kA for 1 second
• External toroid supported for earth-fault measurement on applicable versions
• Breaker opening energy supplied directly by the PR512 for its demagnetisation opening solenoid
• Front optical trip/protection indication
• Operating temperature: -5°C to +40°C
• Storage temperature: -40°C to +90°C
• Relative humidity: up to 90% without condensation
• Degree of protection when installed in switchboard: IP30

Features

• Self-supplied operation: Basic protection does not depend on a separate station auxiliary supply.
• Phase overcurrent protection: Protects against overload and short-circuit conditions.
• Earth-fault protection: Available on applicable PR512 configurations.
• Wide protection setting range: Settings can be adjusted according to the connected feeder and CT arrangement.
• Three-phase setting adjustment: Phase settings can be adjusted together rather than individually.
• RMS current processing: The relay processes RMS current values for protection measurement.
• Breaker trip without separate trip supply: Energy needed for the opening solenoid is supplied through the PR512 arrangement.
• Current indication: Provides an indication of the phase with the highest load.
• Communication option: PR512/PD provides dialogue capability for integration with an installation management system.
• Suitable for unattended substations: Self-powered operation made the PR512 useful where auxiliary services were limited or unavailable.

Applications

ABB PR512 protection relays were used in:

• Medium-voltage distribution switchboards
• Primary distribution substations
• Secondary distribution substations
• ABB HD4 circuit-breaker panels
• ABB HD4 and VD4 service and refurbishment requirements
• MV feeder protection
• MV/LV transformer protection
• Industrial medium-voltage switchgear
• Utility distribution networks
• Unmanned substations
• Existing ABB switchgear refurbishment projects
• Replacement of damaged or failed PR512 protection units

ABB documentation specifically identifies PR512 for protection of MV/LV lines and transformers in primary and secondary distribution switchboards.

ABB PR512 Replacement and Spare Relay Requirements

Since PR512 is an older ABB protection relay, buyers generally search for it when an existing switchboard or circuit breaker is already fitted with a PR512. The exact version matters. PR512/P, PR512/PG and PR512/PD should not be treated as interchangeable simply because they belong to the same PR512 series.

For an ABB PR512 replacement relay enquiry, it is useful to send:

• Existing relay model – PR512/P, PR512/PG or PR512/PD
• ABB ordering code, if available
• Complete relay nameplate photograph
• Circuit-breaker type and rating
• Existing switchgear model
• CT ratio
• Protection functions required
• Quantity
• End-user / project details
• Project country

ABB’s latest service documentation lists 1VCF349899S0111 for PR512/P, 1VCF349899S0112 for PR512/PG and 1VCF349899S0113 for PR512/PD, but also states that PR512 itself is no longer available and replacement requires review of the existing installation rather than a straightforward one-for-one change.

Looking for ABB PR512 Relay?

We handle enquiries for ABB PR512 protection relays, PR512/P, PR512/PG, PR512/PD, ABB PR512 replacement requirements and legacy ABB medium-voltage protection relay requirements.

Share the complete model, ordering code and relay nameplate details for checking the suitable supply or replacement option. For export enquiries, please also provide the quantity and destination country.